How to install the scientific and rational installation of high-speed spindle bearings

High speed machine tool spindle bearing installation should be based on the bearing structure, size and bearing components with the nature of the set, the pressure should be directly added to the end face of the tight fitting ring, not through the rolling body to transmit pressure, the bearing installation generally uses the following methods:

a, press-fit high-speed machine tool spindle bearing inner ring and the shaft tightly fit, the outer ring and the bearing seat hole is loosely fitted, the press can be used to press the bearing on the shaft first, and then the shaft together with the bearing into the bearing In the seat hole, during the press-fitting, the inner ring end surface of the bearing is covered with a soft metal material assembled bushing (copper or mild steel). The inner diameter of the assembly bushing should be slightly larger than the journal diameter, and the outer diameter should be smaller than the bearing diameter. The inner ring is slightly smaller so that it does not press against the cage. When the outer ring of the bearing is tightly fitted with the bearing seat hole and the inner ring is loosely fitted with the shaft, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring, the shaft and the seat hole are tightly fitted, the inner and outer rings of the installation chamber shall be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve shall be capable of simultaneously tightening the inner ring of the bearing and the end face of the outer ring.

b, heating fit through the heating bearing or ntn bearing seat, the use of thermal expansion will be tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of high-speed spindle bearings with a large amount of interference. Before hot loading, place the bearing or the sleeve of the separable bearing into the oil tank and heat it uniformly 80-100°C. Then remove it from the oil and install it on the shaft as soon as possible. In order to prevent the inner ring end face and the shaft shoulder from adhering tightly after cooling, the bearing can be axially fastened after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing block, the hot mounting method of the heating bearing block can prevent the mating surface from being scratched. When heating the bearing with the tank, there should be a grid at a certain distance from the bottom of the tank, or the bearing can be hung with a hook. The spindle bearing of the high speed machine tool cannot be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. The fuel tank must be With a thermometer, strictly control the oil temperature must not exceed 100 °C, in order to prevent the occurrence of tempering effect, so that the hardness of the ferrule reduced.

(1) Maintaining high-speed spindles and their rotation in the spindle of the machine tool Even if the dust is invisible to the eyes, it will have a bad influence on the bearings. Therefore, keep the surroundings clean so that dust does not invade the bearings.

(2) Careful use The strong impact applied to the bearing during use will cause scars and indentations, which will cause accidents. In severe cases, cracks and breakage will occur, so care must be taken.

(3) Use appropriate operating tools to avoid the replacement of existing bearings and use appropriate tools. We often emphasize the importance of tools because too many customers use the wrong tools in the installation to cause damage to the bearings. Pay attention to the corrosion of the bearing (4) When operating the spindle bearing of a high-speed machine tool, the sweat on the hands can become a cause of rust. Pay attention to clean hands and it is best to wear gloves.